The Exontrol's ExEditors Library, contains 16 data
edit controls. Each editor can have a three-state
check box associated and an unlimited number of buttons on the left or right side.
Each button can display an icon or a picture and can have its own tool tip.
Most of the editors are mask based.

Are you looking for a syntax highlighting/built-in HTML edit control? You can find it here

Are you looking for a container control with multiple editors? You can find it here

Features of eXEditors include:

Edit: Provides a standard text edit control

DropDown: Provides an intuitive way for users to select values from a list presented in a drop down window. Each item can display an icon and a caption. The DropDown allows custom strings as well.

DropDownList: Provides an intuitive interface for your users to select values from pre-defined lists presented in a drop-down window. Each item can have an icon associated. The DropDownList editor has no edit control associated.

CheckList: Provides an intuitive way to view and combine one or more values from a pre-defined list presented in a drop down window. Each item has a check box attached, and can display an icon and a caption.

Date: Provides an efficient way for selecting dates for a drop down calendar.

Mask: You can use the Mask editor to enter any data that includes literals and requires a mask to filter characters during data input.

Color,ColorList: Provides an elegant way for selecting colors from a dropdown window. The Color drop down window contains two tabs the pallette tab shows a grid of colors, while the system tab shows the current windows color constants.

Font: Presents the list of fonts into a drop down window. Each item into the drop down window has a preview image for the font selected.